MAXREFDES11 Fresno Reference Design

Maxim Integrated Fresno (MAXREFDES11#) subsystem reference design is a 16-bit high-accuracy industrial analog front end (AFE) that accepts 0 to 10V signals and features isolated power and data—all integrated into a small form factor. The Fresno design integrates an ultra-precision low-noise buffer (MAX44250); a highly accurate ADC (MAX11100); an ultra-high-precision 4.096V voltage reference (MAX6126); 600VRMS data isolation (MAX14850); and isolated/regulated +5.5V, +5V, and -3V power rails (MAX256/MAX1659/MAX1735). This AFE solution can be used in any application that needs high-accuracy analog-to-digital conversion, but it is mainly targeted for industrial sensors, industrial automation, process control, programmable logic controllers (PLCs), and medical applications.

MAXREFDES4 Campbell Reference Design

Maxim's MAXREFDES4 Campbell subsystem reference design is a 16-bit high-accuracy industrial analog front end (AFE) that accepts a 4-20mA current loop or a 0.2V to 4.096V voltage input signal, and features isolated power and data—all integrated into a small form factor. The Campbell design integrates a precision low-noise buffer (MAX44250), a high-accuracy ADC (MAX11100), an ultra-high-precision 4.096V voltage reference (MAX6126), 600VRMS data isolation (MAX14850), and isolated/regulated 5V power rails (MAX256/MAX1659). This AFE solution can be used in any application that needs high-accuracy analog-to-digital conversion, but it is mainly targeted for industrial sensors, industrial automation, process control, programmable logic controllers (PLCs), and medical applications.

MAXREFDES7 Lakewood Reference Design

Maxim's MAXREFDES7 Lakewood Reference Design is a subsystem reference design, that uses an H-bridge transformer driver (MAX256) and a pair of low dropout (LDO) linear regulators (MAX1659 x2) to create a ±12V (±15V) output isolated power supply from a 3.3V voltage input. This general-purpose power solution can be used in many different types of isolated power applications, but is mainly targeted for industrial sensors, industrial automation, process control, and medical.

MAXREFDES8 Riverside Reference Design

Maxim's MAXREFDES8 Riverside Reference Design is a subsystem reference design, that uses an H-bridge transformer driver (MAX256) and a low dropout (LDO) linear regulator (MAX1659) to create a 12V (15V) output isolated power supply from a 3.3V voltage input. This general-purpose power solution can be used in many different types of isolated power applications, but is mainly targeted for industrial sensors, industrial automation, process control, and medical applications.

MAXREFDES9 Oceanside Reference Design

Maxim's MAXREFDES9 Oceanside Reference Design is a subsystem reference design, that uses a step-up controller (MAX668), a 36V H-bridge transformer driver (MAX13256), and a pair of low dropout (LDO) linear regulators (MAX1659 x2) to create a ±15V (±12V) output isolated power supply from a wide range of input voltages. This general purpose power solution can be used in many different types of isolated power applications, but is mainly targeted for industrial sensors, industrial automation, process control, and medical applications.

MAXREFDES33 Palo Verde Reference Design

Maxim MAXREFDES33 Palo Verde Step-Down Converter reference design demonstrates the application of the MAX15062A 60V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The reference design operates over a wide 4.5V to 60V input voltage range, and provides up to 300mA at 3.3V output. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The MAX15062A switches at a fixed frequency of 500kHz, and delivers a peak efficiency of 86.77% with the supplied components when the input is 24V. This general-purpose power solution can be used in many different types of power applications, such as 4-20mA current loops, HVAC and building control, high-voltage LDO replacement, general-purpose point-of-load, etc. In this reference design, the MAX15062 performs in 24V input applications, such as industrial sensors, process control, etc.

MAXREFDES14 Sonoma Reference Design

Maxim's MAXREFDES14 Sonoma Reference Design is an energy measurement subsystem reference design that provides galvanic isolation from the system with a single pulse transformer while using resistors as the sensing elements. The result is a small, cost-optimized board. The Sonoma design utilizes an isolated energy measurement processor (MAX78615+LMU); a multichannel, precision analog-to-digital converter (ADC) (MAX78700); a pulse transformer; optional 20MHz crystal oscillator, and the appropriate sense resistors for converting AC voltage and current into measurable signals. With the embedded load monitoring unit (LMU) firmware and nonvolatile storage of calibration and configuration data, Sonoma is a complete measurement subsystem ready for integration into any design.

MAXREFDES15 Monterey Reference Design

Maxim MAXREFDES15 Monterey Reference Design delivers an ultra-low power, high accuracy 4-20mA 2-wire current loop sensor evaluation board. The 4-20mA current loop is widely used as an analog communication interface in industrial applications for transmitting the data from remote sensors to a programmable logic controller (PLC) in a central control center over a twisted pair cable. Here, 4mA represents the lowest temperature value, and 20mA represents the highest measured temperature. There are four main advantages of the current loop. First, the accuracy of the signal is not affected by the voltage drop in the loop, as long as the power-supply voltage is greater than the total voltage drop across the loop. Secondly, it uses two wires for power as well as data communication over the entire loop. Thirdly, it is more immune to noise. Lastly, it is offered at a low cost and easy installation.

MAXREFDES16 Novato Reference Design

Maxim's MAXREFDES16 Novato Reference Design is a 16-bit, high-accuracy, loop-powered temperature transducer that transmits temperature information from a remote object to the central control unit over a 4-20mA current loop and using the highway addressable remote transducer (HART) communication protocol. Temperature is one of the most widely measured parameters in industrial process control and automation. This reference design provides a complete signal-chain solution that works with any type of RTDs, from PT100 to PT1000. The Novato PT100 2-wire, loop-powered smart temperature transmitter guarantees a low-power, easy-to-use, reliable solution of temperature measurement from -200°C to +850°C with accuracy better than 0.1% or 1.0°C, whichever is more accurate, over the entire operating range.

MAXREFDES12 Corona Reference Design

Maxim's MAXREFDES12 Corona Reference Design provides the front-end interface circuit of a programmable logic controller (PLC) digital input module. The serialization feature allows a large reduction in the number of optocouplers used for isolation. The reference design accepts high-voltage inputs (36V, max) and features isolated power and data—all integrated into a small form factor. The Corona design integrates an octal, digital input translator/serializer (MAX31911), a data isolation device (MAX14850), and an H-bridge transformer driver for isolated power supply (MAX13256). The Corona digital input circuit solution is mainly targeted for digital input modules for PLCs, industrial automation, process automation, and motor control applications.

MAXREFDES18 Carmel Reference Design

Maxim Integrated MAXREFDES18 Carmel Reference Design provides a high-accuracy analog current/voltage output in a compact, galvanically isolated form factor. This design uniquely fits programmable logic controllers, distributed control systems, and other industrial applications. Maxim MAXREFDES18 Carmel design features a MAX5316 16-bit digital-to-analog converter that drives the input of a MAX15500 programmable analog output conditioner. The integrated MAX6126 ultra-high-precision voltage reference provides references for the DAC and the output conditioner. MAX14850 galvanically isolates data communication between the subsystem and the system controller. The subsystem also integrates an isolated and regulated power supply by using the MAX13253 transformer driver and the MAX1659 and MAX1735
low-dropout linear regulators.

MAXREFDES24 Alameda Reference Design

Maxim's MAXREFDES24 Alameda Reference Design features four dense, highly accurate analog outputs in a compact, galvanically isolated form factor. Each channel provides current or voltage. This design uniquely fits in programmable logic controllers (PLC), distributed control systems (DCS), and other industrial applications. The Alameda subsystem combines four high-accuracy (< ±0.1%) outputs with a high-efficiency, low-noise power supply controller on a single board. Alameda offers extreme flexibility—its outputs are configurable to ±10V, ±20mA, 0 to 10V, or 4-20mA for current and voltage applications. Automatic error reporting for detecting open and short circuits, brown-outs, and overtemperature conditions make this subsystem ideal for demanding, precision industrial control and automation applications.

MAXREFDES34 Alcataz Reference Design

Maxim's MAXREFDES34 Alcatraz Reference Design is a subsystem that provides a reference design for securing Xilinx FPGAs to protect IP and prevent attached peripheral counterfeiting. The system implements a SHA-256 challenge-response between the FPGA and a DS28E15 secure authenticator. The DS28E15 communicates over the single-contact 1-Wire® bus, reducing the number of pins necessary to carry out the solution. The reference code defines a combined SHA-256 processor and 1-Wire Master of the host FPGA.

MAXREFDES39 Reference Design

Maxim's MAXREFDES39 Reference Design is a power amplifier (PA) bias reference design that uses the MAX11300, also called a programmable mixed-signal I/O (PIXI™), to bias and monitor a power amplifier for an RF base station application. In this case, an Infineon PTMA210152M-20W is used but any Power Amplifier can be used. The MAX11300 provides a highly integrated solution for the RF power amplifier biasing infrastructure. The design utilizes all of the MAX11300's analog peripherals, while only requiring one MAX11300 device to both bias and monitor a 2-stage RF power amp.

MAXREFDES60 Reference Design

Maxim's MAXREFDES60 Reference Design features a 16-bit, high-accuracy 0V-10V analog output with isolated power and data. The MAXREFDES60 design integrates a low-noise, fast-settling buffer (MAX9632); a 16-bit, low-power DAC (MAX5216); an ultra-high precision 4.096V voltage reference (MAX6126); 600VRMS data isolation (MAX14850); a STMicroelectronics® STM32F4 microcontroller; an FTDI USB-UART bridge; a high-efficiency DC-DC converter (MAX17552); and isolated/regulated +15V, +5.5V, and -3V power rails (MAX17498C/MAX8719/MAX1659/MAX1735). The entire system typically operates at less than 250mW and fits into a space roughly the size of a credit card. While targeted for industrial Micro PLC applications, the MAXREFDES60 can be used in any application that requires high-accuracy analog output.

MAXREFDES61 Reference Design

Maxim's MAXREFDES61 Reference Design features a 16-bit high-accuracy four-channel analog input with isolated power and data. Two of the input channels accept -10V to +10V signals and the other two inputs accept 4mA to 20mA signals. The MAXREFDES61 design integrates a dual low-noise low-distortion buffer (MAX9633); a 16-bit 4-channel multirange input ADC (MAX1301); two high-voltage 4-20mA current protectors (MAX14626) for the current input channels; an ultra-high-precision 4.096V voltage reference (MAX6126); 600VRMS data isolation (MAX14850); a STM32F4 microcontroller; a FTDI USB-UART bridge; a high-efficiency DC-DC converter (MAX15062); and isolated/regulated +15V, +5V, and -3V power rails (MAX17498C/MAX8719/MAX1659/MAX1735). The entire system typically operates at less than 500mW and fits into a space roughly the size of a credit card. While targeted for the industrial, Micro PLC application, MAXREFDES61 may be used in any application that requires high-accuracy analog-to-digital conversion.

MAXREFDES72 Reference Design

Maxim's MAXREFDES72 Reference Design is a Pmod™ adapter for the Arduino platform that addresses incompatibility issues in standards for prototyping platforms. The MAXREFDES72 consists of the MAX14661 Beyond-the-Rails™ 16:2 multiplexer, two MAX14611 level shifters, and the DS3231M real-time clock. The board is configured by writing to the MAX14661 multiplexer over the I2C bus. Eight Arduino digital GPIO are connected to the Pmod connector through level shifters and each of these 8 signals are also connected to the multiplexer. The 8 digital signals were chosen so that the Arduino Uno R3 SPI signals are connected for the Pmod Type 2 and to avoid the I2C and UART signals at the Arduino headers. For Type 1 (GPIO) and Type 2 (SPI), no configuration is necessary. To implement Type 3, Type 4, I2C, or other custom pin mappings that need access to I2C, UART, or other real time functions such as PWM, configure the multiplexer to route the signals to the appropriate pins.

MAXREFDES74 Reference Design

Maxim's MAXREFDES74 Reference Design performs high-speed, 18-bit, precision data acquisition based on Maxim's leading-edge, high-accuracy, low-power data converters. The MAXREFDES74 design works as a building block for a high-speed, low-power, high-accuracy data acquisition and control system for industrial process control and automation, and high-speed protection systems for power distribution and automation. By changing the ADC and DAC to pin-compatible 16-bit devices such as the MAX11166 and the MAX5316, a 16-bit data acquisition system can also be tested.

MAXREFDES41 Fresno Reference Design

Maxim's MAXREFDES41 Reference Design demonstrates the application of the MAX17599 low IQ, wide-input range, active clamp current-mode PWM controller. The MAX17599 contains all the control circuitry required for the design of wide-input isolated forward-converter industrial power supplies. The reference design operates over an 18V to 36V input voltage range, and provides up to 3.5A at 12V output. The reference design features the active-clamp transformer reset topology for forward converters. This reset topology has several advantages including reduced voltage stress on the switches, transformer size reduction due to larger allowable flux swing, and improved efficiency due to elimination of dissipative snubber circuitry. These features result in a compact and cost-effective isolated power supply. The design is set to switch at 250kHz. For EMI-sensitive applications, the user can program the frequency-dithering scheme, enabling low-EMI spread-spectrum operation.

MAXREFDES48 Reference Design

Maxim's MAXREFDES48 Reference Design demonstrates the application of the MAX17599 low IQ, wide-input range, active clamp current-mode PWM controller. The MAX17599 contains all the control circuitry required for the design of wide-input isolated forward-converter industrial power supplies. The reference design operates over an 18V to 36V input voltage range, and provides up to 3.5A at 12V output. The reference design features the active-clamp transformer reset topology for forward converters. This reset topology has several advantages including reduced voltage stress on the switches, transformer size reduction due to larger allowable flux swing, and improved efficiency due to elimination of dissipative snubber circuitry. These features result in a compact and cost-effective isolated power supply. The design is set to switch at 250kHz. For EMI-sensitive applications, the user can program the frequency-dithering scheme, enabling low-EMI spread-spectrum operation.